chore(deps-dev): bump stylelint from 16.20.0 to 16.21.1

Bumps [stylelint](https://github.com/stylelint/stylelint) from 16.20.0 to 16.21.1.
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/main/CHANGELOG.md)
- [Commits](stylelint/stylelint@16.20.0...16.21.1)

---
updated-dependencies:
- dependency-name: stylelint
  dependency-version: 16.21.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]